Importance of buffering nanolayer position in Layer-by-Layer assembly on titania based hybrid photoactivity

Brezhneva, Nadzeya; Никитина, А. А.; Ryzhkov, Nikolay V.; Klestova, Anastasiya; Vinogradov, Alexandr V.; Skorb, Ekaterina V.

doi:10.1007/s10971-018-4728-5

Cited by 13 publications

(16 citation statements)

References 25 publications

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“…Thus, the action of surrounding polyelectrolyte chains affects diffusion through polyelectrolyte assemblies significantly and diffusion is thermoactivated (Spruijt et al, 2008). Internal interfaces predetermine the properties of polyelectrolyte multilayers, and one should therefore keep in mind the composition and structure of the multilayer, the internal layer chemistry, and interactions between components when designing functional polyelectrolyte multilayers (Brezhneva et al, 2019). The means of changing the permeability of polymer layers mentioned above have already found extensive use in the development of semipermeable separating membranes and electrochemical sensors with improved selectivity, sensitivity, and response time.…”

Section: Discussion Of Soft Matter Assemblies For Controlling Ion Fluxesmentioning

confidence: 99%

Localization of Ion Concentration Gradients for Logic Operation

et al. 2019

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Adjustment of the environmental acidity is a powerful method for fine-tuning the outcome of many chemical processes. Numerous strategies have been developed for the modification of pH in bulk as well as locally. Electrochemical and photochemical processes provide a powerful approach for on-demand generation of ion concentration gradients locally at solid-liquid interfaces. Spatially organized in individual way electrodes provide a particular pattern of proton distribution in solution. It opens perspectives to iontronics which is a bioinspired approach to signaling, information processing, and storing by spatial and temporal distribution of ions. We prove here that soft layers allow to control of ion mobility over the surface as well as processes of self-organization are closely related to change in entropy. In this work, we summarize the achievements and discuss perspectives of ion gradients in solution for information processing.

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Section: Discussion Of Soft Matter Assemblies For Controlling Ion Fluxesmentioning

confidence: 99%

Localization of Ion Concentration Gradients for Logic Operation

et al. 2019

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“…Narrow localization of the acidification phenomenon should also be noted for TiO 2 / (PSS/PEI) 3 under 365 nm 5 mW cm −2 illumination. Thus, one can remotely change the local pH from neutral to acidic with high spatial resolution by irradiating the photoactive surface of TiO 2 modified by a PEM of special nanoarchitecture [45].…”

Section: Ph-responsive Lipid Bilayermentioning

confidence: 99%

A platform for light-controlled formation of free-stranding lipid membranes

Ryzhkov

Skorb

2020

J. R. Soc. Interface.

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The engineering of artificial cells is one of the most significant scientific challenges. Thus, controlled fabrication and in situ monitoring of biomimetic nanoscale objects are among the central issues in current science and technology. Studies of transmembrane channels and cell mechanics often require the formation of lipid bilayers (LBs), their modification and their transfer to a particular place. We present here a novel approach for remotely controlled manipulation of LBs. Layer-by-layer deposition of polyethyleneimine and poly(sodium 4-styrenesulfonate) on a nanostructured TiO 2 photoanode was performed to obtain a surface with the desired net charge and to enhance photocatalytic performance. The LB was deposited on top of a multi-layer positive polymer cushion by the dispersion of negative vesicles. The separation distance between the electrostatically linked polyelectrolyte cushion and the LB can be adjusted by changing the environmental pH, as zwitter-ionic lipid molecules undergo pH-triggered charge-shifting. Protons were generated remotely by photoanodic water decomposition on the TiO 2 surface under 365 nm illumination. The resulting pH gradient was characterized by scanning vibrating electrode and scanning ion-selective electrode techniques. The light-induced reversible detachment of the LB from the polymer-cushioned photoactive substrate was found to correlate with suggested impedance models.

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“…It exists in several crystalline modifications (rutile, anatase, brookite) and various forms (nanoparticles, nanotubes [6], nanofibers [7] and nanosheets [8]) and photocatalytic characteristics are highly dependent on crystallinity [9], phase composition, and method of the material obtaining [10]. The photoelectrochemical behavior can also be changed by doping [11] and surface modification [12,13]. Establish a relationship between photocatalyst morphology, elemental, and phase composition is a task of fundamental importance.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Photocurrent Switching Effect in Nanostructured Anodized Titanium Dioxide and Enhancement of its Photocatalytic Activity by Layer-by-layer Polyelectrolyte Assembly

Ryzhkov¹,

Yurova²,

Brezhneva³

et al. 2020

RENSIT

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This article reports effect of photoelectrochemical photocurrent switching on anodized titanium dioxide which was observed for the first time for this material. When negatively polarized, TiO 2 photoelectrode gave anodic photocurrent under 365 nm irradiation and cathodic one under 405 nm irradiation. We suppose, this phenomenon can be explained by electron pathways provided by Ti 3+ states occurring in anodized TiO 2 during annealing. We also demonstrate here effect of anodic photocurrent increase after photoelectrode surface was modified by (PSS/PEI) 3 Layer-by-layer assembly. Photoanodic performance is three times higher for TiO 2 /(PSS/PEI) 3 than for bare TiO 2 .

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Importance of buffering nanolayer position in Layer-by-Layer assembly on titania based hybrid photoactivity

Cited by 13 publications

References 25 publications

Localization of Ion Concentration Gradients for Logic Operation

Localization of Ion Concentration Gradients for Logic Operation

A platform for light-controlled formation of free-stranding lipid membranes

Photoelectrochemical Photocurrent Switching Effect in Nanostructured Anodized Titanium Dioxide and Enhancement of its Photocatalytic Activity by Layer-by-layer Polyelectrolyte Assembly

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